node.js 将 node/express 中的文件流式传输到客户端
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Stream files in node/express to client
提问by Tim
I want to stream content to clients which is possibly stored in db, which they would save as files.
我想将内容流式传输到可能存储在 db 中的客户端，他们会将其另存为文件。
Obviously res.download would do the job nicely, but none of the response.* functions accept a stream, only file paths.
显然 res.download 可以很好地完成这项工作，但没有一个 response.* 函数接受流，只接受文件路径。
I had a look at res.download impl and it just sets Content-Disposition header and then a sendfile.
我查看了 res.download impl，它只设置了 Content-Disposition 标头，然后设置了一个发送文件。
So I could achieve this using this post as a guide. Node.js: pipe stream to response freezes over HTTPS
所以我可以使用这篇文章作为指导来实现这一点。 Node.js：响应的管道流通过 HTTPS 冻结
But it seems I would miss out on all the wrapping aspects that res.send performs.
但似乎我会错过 res.send 执行的所有包装方面。
Am I missing something here or should I just do the pipe and not worry about it - what is best practice here?
我是否在这里遗漏了什么，或者我应该只做管道而不用担心 - 这里的最佳实践是什么？
Currently creating temp files so I can just use res.download for now.
目前正在创建临时文件，所以我现在可以使用 res.download。
回答by Morgan ARR Allen
You can stream directly to the response object (it is a Stream).
您可以直接流式传输到响应对象（它是一个 Stream）。
A basic file stream would look something like this.
一个基本的文件流看起来像这样。
function(req, res, next) {
if(req.url==="somethingorAnother") {
res.setHeader("content-type", "some/type");
fs.createReadStream("./toSomeFile").pipe(res);
} else {
next(); // not our concern, pass along to next middleware function
}
}
This will take care of binding to dataand endevents.
这将负责绑定到data和end事件。
回答by sasidhar79
Make sure that your AJAX request from the client has an appropriate 'responseType' set. for example like
确保来自客户端的 AJAX 请求设置了适当的“responseType”。例如像
$http({
method :'GET',
url : http://url,
params:{},
responseType: 'arraybuffer'
}).success()
